It could also be related to his relationship with the gods. Percy has had a lot of run - ins with the gods, and they haven't always been fair to him. He might be feeling used or unappreciated by them. This feeling of being taken advantage of could be weighing him down and causing his depression.
One possible cause could be the stress from all his past quests. He's been through so much, faced many dangerous situations, and lost some friends along the way.
Maybe it's his sense of not belonging. Despite being part of the seven and having friends, he might still feel like an outsider sometimes. For instance, he has a different upbringing compared to some of the others. He grew up as a half - blood in New York while some of the others come from different places or backgrounds. This difference could be making him feel isolated and leading to his depression.
They might be shocked at first. They probably didn't expect Percy, who is usually so strong and brave, to be dealing with depression.
One possible cause could be the loss of a loved one. In many stories, this kind of trauma can lead to depression. Percy might be struggling to come to terms with the death or departure of someone close to him.
One possible cause could be the aftermath of the war. He was on the losing side, and he might feel guilty for the things he did during the war, like helping the Death Eaters. He might be haunted by the memories of the violence and destruction he witnessed or was a part of.
It could be related to his past traumas. All the battles he's been through, the losses he's suffered, might be weighing on him and he doesn't know how else to deal with the emotional pain.
Perhaps there's a power struggle in the story world. Percy might be seen as a threat to certain groups or individuals who then resort to abuse as a means to gain control over him. Another reason could be related to his family background. If his family has some sort of enemies, they might take out their anger on Percy.
The seven in this fanfiction are probably a set of characters who are central to the plot along with Percy. They could be his friends or allies in the world of demigods. Maybe they are characters like Annabeth, Jason, Piper, Leo, Hazel, Frank, and others who are on the same side as Percy in the fight against the forces of evil in their fictional world.
It could be due to social isolation. Maybe she has been ostracized by her peers or community in the fanfiction world, which makes her feel alone and unworthy. This lack of connection can lead to deep - seated depression.
Well, in fanfiction, one reason could be the loss of his friends. Percy has been through so many battles, and if he loses someone close like Annabeth or Grover, it could send him into a deep depression. Another reason might be the burden of his prophecies. He's constantly expected to save the world, and that kind of pressure can wear a person down over time.
The others in the seven, like Jason, would probably feel a sense of guilt for not noticing earlier. They would come together as a group to support Percy. Jason might offer his friendship and strength to Percy, telling him he doesn't have to face it alone anymore. They would also likely start to investigate who was responsible for the abuse.
It could lead to a stronger bond among the seven. They would become more united in protecting each other.